One to bookmark if you're trying to avoid travelling by air, or you just want to find out how to get from A to B overland. Mark Smith's cult website - named after his favourite Eurostar seat - is a helpful worldwide journey planning tool for train and boat travel. You can find out just about everything you need to know to organise a journey (there are even photos of most trains on most routes). The only thing it doesn't do is sell tickets, but it tells you how to do that and contains all the relevant links.
Like that? Try www.nationalrail.co.uk; www.deutsche-bahn.co.uk